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Sound velocity in dense stellar matter with strangeness and compact stars

文献类型：期刊论文

作者Xia, Chengjun1; Zhu, Zhenyu2; Zhou, Xia3; Li, Ang2
刊名CHINESE PHYSICS C
出版日期2021-05-01
卷号45期号:5页码:10
ISSN号1674-1137
关键词quark matter hadron-quark phase transition neutron star
DOI10.1088/1674-1137/abea0d
通讯作者Li, Ang(liang@xmu.edu.cn)
英文摘要The phase state of dense matter in the intermediate density range (similar to 1-10 times the nuclear saturation density) is both intriguing and unclear and can have important observable effects in the present gravitational wave era of neutron stars. As matter density increases in compact stars, the sound velocity is expected to approach the conformal limit (c(s)/c = 1/root 3) at high densities and should also fulfill the causality limit (c(s)/c < 1). However, its detailed behavior remains a prominent topic of debate. It was suggested that the sound velocity of dense matter could be an important indicator of a deconfinement phase transition, where a particular shape might be expected for its density dependence. In this work, we explore the general properties of the sound velocity and the adiabatic index of dense matter in hybrid stars as well as in neutron stars and quark stars. Various conditions are employed for the hadron-quark phase transition with varying interface tension. We find that the expected behavior of the sound velocity can also be achieved by the nonperturbative properties of the quark phase, in addition to a deconfinement phase transition. Moreover, it leads to a more compact star with a similar mass. We then propose a new class of quark star equation of states, which can be tested by future high-precision radius measurements of pulsar-like objects.
WOS关键词EQUATION-OF-STATE ; QUARK MATTER ; PHASE-TRANSITION ; MAXIMUM MASS ; NUCLEAR-MATTER ; HYBRID STARS ; NEUTRON ; CONSTRAIN ; PARAMETERS ; LIGHT
资助项目National SKA Program of China[2020SKA0120300] ; National Natural Science Foundation of China[11873040] ; Youth Innovation Fund of Xiamen[3502Z20206061] ; Ningbo Natural Science Foundation[2019A610066] ; CAS Light of West China Program[2018-XBQNXZ-B-025] ; Tianshan Youth Program[2018Q039]
WOS研究方向Physics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000646853000001
资助机构National SKA Program of China ; National Natural Science Foundation of China ; Youth Innovation Fund of Xiamen ; Ningbo Natural Science Foundation ; CAS Light of West China Program ; Tianshan Youth Program
源URL[http://ir.xao.ac.cn/handle/45760611-7/4008]  
专题脉冲星研究团组
通讯作者Li, Ang
作者单位1.Zhejiang Univ Ningbo, Inst Technol, Sch Informat Sci & Engn, Ningbo 315100, Peoples R China
2.Xiamen Univ, Dept Astron, Xiamen 361005, Peoples R China
3.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China
推荐引用方式
GB/T 7714		 Xia, Chengjun,Zhu, Zhenyu,Zhou, Xia,et al. Sound velocity in dense stellar matter with strangeness and compact stars[J]. CHINESE PHYSICS C,2021,45(5):10.
APA Xia, Chengjun,Zhu, Zhenyu,Zhou, Xia,&Li, Ang.(2021).Sound velocity in dense stellar matter with strangeness and compact stars.CHINESE PHYSICS C,45(5),10.
MLA Xia, Chengjun,et al."Sound velocity in dense stellar matter with strangeness and compact stars".CHINESE PHYSICS C 45.5(2021):10.

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来源：新疆天文台

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